Basic Level     Skills: Not specified    
Author
Author email
[email protected]
Author website
www.rickeyworld.info

Description



DS1307 is a hardware realtime clock, which works on I2C protocol. Better graphics using the same old fashioned alphanumeric LCD (type HD44780). Icons which shows the status for Alarm ON/OFF state, which gives a nice and cute look to the clock.

There are four switches connected to the uC, as shown in the figure. Function of the keys are same as clear from their names.

When the power supply is switched on it will give you the default date and time, but later you can change it to the desired value. After setting once, the backup battery will keep the clock ticking even after the power is not there.

A little about I2C:
There are basically four main conditions in I2C protocol.
1) Start Condition
2)Stop Condition
3)Data Validity
4)Acknowledgement

1)Start Condition:
when SCL is high and SDA H->L, will be taken as start condition for the communication.
2)Stop Condition:
when SCL is high and SDA L->H, will generate a stop condition.
3)Data Validity:
When SCL is high there should be no chande in SDA line only then the data is valid, the data change should be made only when SCL is low.
4)Acknowledgement:

After sending of one byte of data the reciever has to acknowledge the sender for the successful reception. for this the sender make the SDA line high and reciever pulls down the SDA low, which tells the sender that data has reached safely.

Now the source code written in assembly, basically implements the I2C protocol. the assembly source written for Keil download here clock.asm and the direct hex file for programming the controller from here clock.hex. The schematic for the Digital clock is available in PDF format can be downloaded from here clock.pdf.

Project code has been revised and updated. Bug fixes regarding corrupt display.

History:
First Upload date:
08/05/2006
  Filesize

  Downloads

83433

  Rating
 

Comments

(Required; Min length 5)
(Required; will not be displayed)

Conversation

ExperimenterUK
Thu Nov 20 2014, 06:00 PM
@Mehboob.. I don't think you can do that.
Sat Nov 15 2014, 06:41 AM
Mehboob
Pls can you send me code in c of PWM generation using UART/serial port in 8051.
Fri Nov 14 2014, 02:51 PM
mohammad aqil
NEED A BOOK ON MICROPROCESSOR AND INTERFACING BY D.V.HALL. RIGHT NOW, I SHALL BE VERY THANK FULL TO U....
Thu Nov 13 2014, 02:15 PM
m
please code hex project avr blood pressure monitor
Thu Nov 13 2014, 05:56 AM
Lambo
hi mate, whats the ajay-bhargav? tell us more pls
ExperimenterUK
Wed Nov 12 2014, 12:56 AM
@tmtm000.. have you been able to join ?
ExperimenterUK
Wed Nov 12 2014, 12:54 AM
@Alice..become a member,then send a PM to ajay_bhargav the site owner.
Tue Nov 11 2014, 03:58 AM
Abhishek Bansal
Thanks a lot for your informative tutorials!
Mon Nov 10 2014, 09:03 AM
Alice
Hello, This is Alice from a PCB rototype manufacturer. Our company is interested in your website contents, and wonder if we can advertise our company with payment on your website. There are two ways to advertise: first, if we an get a instant quote section on your main site columns; second, whether we can get a advertising section if you have any avaliable one. If any of above ways avaliable, please contact me with your detailed scheme and advertising charge. Thanks. Alice
Sat Nov 08 2014, 11:58 AM
Mohamed_123sd
Signals and Systems, 2nd Edition by Alan V. Oppenheim Alan S.willsky with S.Hamid Nawab?

Downloads

Comments

VikiPeter
Tue Nov 18 2014, 09:13 AM
gentlboy
Sun Nov 16 2014, 11:13 PM
philipeastbourne
Wed Nov 12 2014, 05:32 AM
astra91
Mon Nov 10 2014, 08:11 AM
francise
Thu Nov 06 2014, 02:55 AM
ashbir
Tue Nov 04 2014, 11:13 PM
shruthig
Tue Nov 04 2014, 10:50 AM
sk8boardboy
Mon Nov 03 2014, 11:20 AM

Online

Guests: 56, Members: 0 ...

most ever online: 182184
(Members: , Guests: 182184) on 06 Aug 2010: 05:37 AM

Members: 37547
Newest member: VikiPeter
Forum Activity
ExperimenterUK Avatar
Posted By ExperimenterUK
Sat Nov 22 2014, 06:15 AM
@ExperimenterUKI make small table to observe Outpu...
Max.otto Avatar
Posted By Max.otto
Fri Nov 21 2014, 02:31 PM
@ExperimeterUKForgot my last question.As i told be...
Max.otto Avatar
Posted By Max.otto
Fri Nov 21 2014, 02:05 PM
@ExperimenterUKI make small table to observe Outpu...
Max.otto Avatar
Posted By Max.otto
Fri Nov 21 2014, 01:12 PM
@ExperimenterUKThank u. I do it. Ohne Period it's ...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Nov 20 2014, 05:56 PM
You set the on/off times here as 47%float PWMcom...
vijay.parmar1992 Avatar
Posted By vijay.parmar1992
Thu Nov 20 2014, 04:06 AM
Right now i am studying Bootloader.I want to writ...
Max.otto Avatar
Posted By Max.otto
Wed Nov 19 2014, 03:11 PM
How can i get PWM on-off time..?pls check the atta...
Max.otto Avatar
Posted By Max.otto
Wed Nov 19 2014, 03:05 PM
I am using PSoC 5LP.pls check the attached design ...
ankitbajaj01 Avatar
Posted By ankitbajaj01
Wed Nov 19 2014, 01:49 PM
Thanks for the prompt response, I will try it out ...
engr1931 Avatar
Posted By engr1931
Wed Nov 19 2014, 11:45 AM
this one sir! i attached the whole project! ...